#include #include #include #include #include #include "ow_search.h" // ----------- DEMO ----------------- void main(void) { // The search algorithm stores its internal state in a struct. // This allows calling it repeatedly if there are more devices // than could fit in the address buffer. struct ow_search_state search_state; ow_search_init(&search_state, 0xF0); // SEARCH_ROM // Buffer for the found addresses - can have up to 65536 rows // Keep in mind that each address uses 8 bytes #define CODE_BUFFER_LEN 8 ow_romcode_t addresses[CODE_BUFFER_LEN]; // The algorithm stores its return value in the status field, // we can loop until it becomes OW_SEARCH_DONE or OW_SEARCH_FAILED while (search_state.status == OW_SEARCH_MORE) { // Perform a run of the algorithm uint16_t count = ow_search_run(&search_state, addresses, CODE_BUFFER_LEN); // Do something with the found addresses printf("Found %d addresses, status %d\n", count, search_state.status); for (int i = 0; i < count; i++) { printf("> "); for (int j = 0; j < 8; j++) { printf("%02x ", addresses[i][j]); } uint64_t numeric = ow_romcode_to_u64(addresses[i]); printf(" (0x%016"PRIx64")\n", numeric); } printf("\n"); } } // ------------ SIMULATOR --------------- // A simple 1-wire bus simulation following the real behavior of bus devices // in the search operation. struct owunit { ow_romcode_t romcode; bool selected; uint8_t rompos; int state; }; #define UNITS_COUNT 12 struct owunit units[UNITS_COUNT] = { {.romcode = {0b00000000}},//00 {.romcode = {0b00000001}},//01 {.romcode = {0b00010001}},//11 {.romcode = {0b00110001}},//31 {.romcode = {0b00110101}},//35 {.romcode = {0b01010001}},//51 {.romcode = {0b10000000}},//80 {.romcode = {0b10101010}},//aa {.romcode = {0b11110101}},//f5 {.romcode = {0b11110111}},//f7 {.romcode = {0xFF,0x00,0xFF,0x00,0x55,0x00,0xAA,0x00}}, {.romcode = {0x12,0x34,0x56,0x78,0x9a,0xbc,0xde,0xf0}}, }; bool rom_device_reset(struct owunit *device) { device->rompos = 0; device->state = 0; device->selected = true; } bool rom_device_read(struct owunit *device) { if (!device->selected) return true; if (device->state == 0) { device->state++; bool res = ow_code_getbit(device->romcode, device->rompos); return res; } if (device->state == 1) { device->state++; bool res = !ow_code_getbit(device->romcode, device->rompos); return res; } } void rom_device_write(struct owunit *device, bool selectedbit) { if (!device->selected) return; if (ow_code_getbit(device->romcode, device->rompos) != selectedbit) { device->selected = false; } else { device->rompos++; device->state = 0; } } bool ow_reset(void) { for (int i = 0; i < UNITS_COUNT; ++i) { rom_device_reset(&units[i]); } return (UNITS_COUNT > 0); } bool ow_read_bit(void) { bool bus = 1; for (int i = 0; i < UNITS_COUNT; ++i) { bus &= rom_device_read(&units[i]); } return bus; } void ow_write_bit(bool value) { for (int i = 0; i < UNITS_COUNT; ++i) { rom_device_write(&units[i], value); } } void ow_write_u8(uint8_t value) { // Dummy, do nothing }